gitk: Fix missing commits when using -S or -G

When -S or -G is used as a filter option, the resulting commit list
rarely contains all matching commits. Only a certain number of commits
are displayed and the rest are missing.

"git log --boundary -S" does not return as many boundary commits as you
might expect. gitk makes up for this in closevarcs() by adding missing
parent (boundary) commits. However, it does not change $numcommits,
which limits how many commits are shown. In the end, some commits at the
end of the commit list are simply not shown.

Change $numcommits whenever a missing parent is added to the current
view.

Signed-off-by: Stefan Dotterweich <stefandotterweich@gmx.de>
Signed-off-by: Paul Mackerras <paulus@ozlabs.org>

gitk

@@ -1315,7 +1315,7 @@ proc commitonrow {row} {
 
 proc closevarcs {v} {
     global varctok varccommits varcid parents children
-    global cmitlisted commitidx vtokmod
+    global cmitlisted commitidx vtokmod curview numcommits
 
     set missing_parents 0
     set scripts {}
@@ -1340,6 +1340,9 @@ proc closevarcs {v} {
 	    }
 	    lappend varccommits($v,$b) $p
 	    incr commitidx($v)
+	    if {$v == $curview} {
+		set numcommits $commitidx($v)
+	    }
 	    set scripts [check_interest $p $scripts]
 	}
     }